Synonym word of unassured:

backward, bashful, blushing, close, coy, decorous, diffident, earnest, humble, modest, nice, prim, prissy, proper, prudish, reticent, retiring, sedate, serious, shy, silent, skittish, sober, solemn, staid, strait-laced, timid, unassertive, unassuming, unassured